CAE343 Fatigue and Fracture Mechanics Syllabus:
CAE343 Fatigue and Fracture Mechanics Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
Of this course are
01. To learn about mathematical and principles of facture mechanics
02. To impart the knowledge about the fundamental source of failure of mechanical components.
03. To make students understand the fatigue design curve approaches and limitations
04. To make the students learn the characterization of variables in cyclic loads.
05. To expand student’s knowledge on testing of the material for the fatigue failure
UNIT I FATIGUE OF STRUCTURES
S.N. curves – Endurance limits – Effect of mean stress, Goodman, Gerber and Soderberg relations and diagrams – Notches and stress concentrations – Neuber’s stress concentration factors – Plastic stress concentration factors – Notched S.N. curves – Fatigue of composite materials.
UNIT II STATISTICAL ASPECTS OF FATIGUE BEHAVIOUR
Low cycle and high cycle fatigue – Coffin – Manson’s relation – Transition life – cyclic strain hardening and softening – Analysis of load histories – Cycle counting techniques -Cumulative damage – Miner’s theory – Other theories.
UNIT III PHYSICAL ASPECTS OF FATIGUE
Phase in fatigue life – Crack initiation – Crack growth – Final Fracture – Dislocations – fatigue fracture surfaces.
UNIT IV FRACTURE MECHANICS
Strength of cracked bodies – Potential energy and surface energy – Griffith’s theory – Irwin – Orwin extension of Griffith’s theory to ductile materials – stress analysis of “cracked bodies – Effect of thickness on fracture toughness” – stress intensity factors for typical ‘geometries.
UNIT V FATIGUE DESIGN AND TESTING
Safe life and Fail-safe design philosophies – Importance of Fracture Mechanics in aerospace structures – Application to composite materials and structures.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
Students will be able to
CO1: Apply the mathematical knowledge to define fatigue behaviours of the materials
CO2: Identify the causes for the fatigue failure of the materials.
CO3: Ability to analyse the fracture due to fatigue
CO4: Select the testing method for the fatigue failure prediction of the materials.
CO5: Solve the causes of the crack initiation & its growth.
CO6: Select the materials with ability to with damage tolerant structures
TEXT BOOKS:
1. Barrois W, Ripely, E.L., “Fatigue of aircraft structure,” Pergamon press. Oxford, 1983.
2. Prasanth Kumar, “Elements of fracture mechanics”, Wheeter publication, 1999.
REFERENCES:
1. Kare Hellan ,’Introduction to Fracture Mechanics’, McGraw Hill, Singapore,1985
2. Knott, J.F., “Fundamentals of Fracture Mechanics,” – Buterworth & Co., Ltd., London, 1983.
3. Sih C.G., “Mechanics of fracture.” Vol – I, Sijthoff and w Noordhoff International Publishing Co., Netherlands, 1989.